A small pyroclastic flow went off at the Indonesian volcano Merapi yesterday. It generated a seismic signal of 120 seconds duration and with a maximum amplitude of 45 mm. Contrary to expectations, it did not flow over the southern flank, where the large vent is located, but over a field further west. This is where most of the pyroclastic flows from the 2006 eruption departed. Looking at satellite photos, one can see that steam is also rising from the northwest crater area; this is where the dome appears to be growing the most. The VAAC detected volcanic ash at 3000 m altitude. A total of 440 earthquakes were registered.